class Car:
    """一次模拟汽车的简单尝试"""
    def __init__(self, make, model, year):
        """初始化描述汽车的属性"""
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        """返回整洁的描述性名称"""
        long_name = f"{self.year} {self.make} {self.model}"
        return long_name.title()

    def read_odometer(self):
        """打印一条指出汽车里程的消息"""
        print(f"This car has {self.odometer_reading} miles on it.")

    def update_odometer(self, mileage):
        """将里程表读数设置为指定的值"""
        if mileage >= self.odometer_reading:
            self.odometer_reading = mileage
        else:
            print("You can't roll back an odometer!")

    def increment_odometer(self, miles):
        """将里程表读数增加指定的量"""
        self.odometer_reading += miles

class Battery:
    """一次模拟电动汽车电池的简单尝试"""
    def __init__(self, battery_size=40):
        """初始化电池的属性"""
        self.battery_size = battery_size

    def describe_battery(self):
        """打印一条描述电池容量的消息"""
        print(f"This car has a {self.battery_size}-KWH battery")

    def get_range(self):
        """打印一条消息，指出电池的续航里程"""
        if self.battery_size == 40:
            range = 150
            print(f"This car can go about {range} miles on a full charge.")
        elif self.battery_size == 65:
            range = 225
            print(f"This car can go about {range} miles on a full charge.")

    def upgrade_battery(self):
        if self.battery_size < 65:
            self.battery_size = 65

class ElectricCar(Car):
    """电车的独特之处"""
    def __init__(self, make, model, year):
        """先初始化父类的属性，再初始化电动汽车特有的属性"""
        super().__init__(make, model, year)
        self.battery = Battery()

print("Make an electric car, and check the range:")
my_leaf = ElectricCar('nissan', 'leaf', 2024)
my_leaf.battery.get_range()

print("\nUpgrade the battery, and check the range again:")
my_leaf.battery.upgrade_battery()
my_leaf.battery.get_range()